6	5		4	2
		4		7
	7
4				3			5
6			8				7
						8
			2		7
1	4		7	6

Difficulty: Super easy (0)

					2
6			2				3
			6		7
					5	3
	1	6
		8		1
1				5			6
		7

Difficulty: Easy (0)

	3				4	6	5
	5						8
						2
3		1
					6		3
	1
1						3
8	6	7				5

Difficulty: Easy (0)

8					5
		4		3
			2
		3	7		4
		5		2	8
				4
			5		2
		8					6

Difficulty: Very easy (0)